Refractory lining for furnaces.



UNITED STATES PATENT curios.

OTTOKAR SEBPEK, OF PARIS, FRANCE, ASSIG-NOR TO SOGIE'IE GENERALE DES INI'IRURES, OF PARIS, FRANCE.

REFRACTORY LINING FOR FURNACES.

No Drawing.

' 7 To all 107mm) it may concern:

.as carbon and magnesia present certain disadvantages: they reactreadily with the materials under treatment, they disintegrate I quiteeasily and in the case of electrical furindustries. It possesses theproperty of be- I '30 naces, they become at these temperatures goodconductors of 'electricitylf Moreover, more particularly asregardsmagnesia, this presents the disadvantage of becoming fusi ble atthese temperatures.

' The presentinvention consists in the use of aliuniniuin nitridfor'theformation of the linings of any'kind of industrial fur naces used intheinetallurgic, chemical, etc.,

ing able to be agglomerated; thus it HEW be very easily molded in theshape of blocks, bricks-er briquets by using any suitable ad- .hesivewhich, in the case where these bricks are "used -as coverings I forelectrical furnaces, is selected"preferably so as to leave no conductingportions in the blocks -'or bricks after the latter have been baked.- Asuitable agglomerant is the sodium. silicate which can be used inany-suitable proportion. Ithas'been found that tenper cent. of sodiumsilicate forms a suitable proportion. I

The bricks being placed in thefurnace and the latter set inaction athigh tempera ture, the sodium silicate is eliminated gradually withoutcaus ng any disaggregation.

Such bricks possess likewise the wonderful Specification of LettersPatent. Application filed January as, 1912. Serial n). 673,629.

Patented Jun 2, 1914.

property of resisting the corrosive action of great number of chemicalagents for 1n stance of sodium salts and therefore they may beadvantageously used in all the inprincipally in fixedor mechanicalfurnaces used in the chemical industry. In some cases, instead, of usingpure aluminium nitrid, the lining or the bricks may be made of a mixtureof carbon and; alumina .or'alumi-' nous materialstransformed intonitrid-on dustria-l furnaces of any kind of heating and 1 the surfaceonly (by heating in a currentof nitrogen). Or ainiixture ofaluminiumnitrid, carbon and alumina (or aluniinous m'a- .terials) in any suitableproportions may be agglomerated. I

\Vhat I claim and-desire to secure by Let-' ters Patent ofthe UnitedStates is y p l. A furna-ce'pro-vided with alining havmg as itsessentialingredient aluminium n1- tri'd to resist the action. of heat.and chemical agents. 1 '1 '2. A furnace provided with a lining,consistiirg essentially of aluminium'nitri carbon and aluminousmaterial.

3; A furnace provided with a lining, consisting of aluminium nitrid,with a backing of carbon and aluminousmaterial.

nace linings, consisting in lining the furnace with a mixture of carbonand aluminous material and then transforming the surface only intonitrid. l i

The method'described of forming furnace linings, consisting in liningthe furnace with a mixture of carbon and aluminous 4.The'm'ethoddescribed of forming furmaterial'and then transformingthesurface only into vnitrid by heating in a current of nitrogen.

In'testnnony whereof I haye signed my name to this specification, in thepresence of two subscribing witnesses.

, TTQKAR sERrEK.

WVitnesses CHARLES Donn, Ensiann Lasers.

Copies 01 this patent maybe obtained for five cents each, by addressingthe commissioner of Patents,

' Washington, I. U.

